I honestly feel so bad for her. I hope she's living a happy life): we need to have doctors that specialize in chickens lol that'd be amazing. Most vets don't know what the heck to do with chickensI have a pullet that has a leg that goes straight back and stiff with her hip sticking out at the socket of that leg. I feel bad for her and I usually would cull a bird if I see this. I have no ideal what's wrong and she will never walk. She's 4 months old and has been doing this since she was about a month an half old.
But I keep her as she eats and drinks good. She is a mille frizzle Cochin bantam so I do trim all the feathers off that bad leg. She dose poo on it and everyday I was it if need be and put vasilen on it to keep if from getting burned by her poo. I take her outside everyday while doing chore so she gets grass, sun, and fresh air.
She's a sweetie and will do all that I can to keep her cunffy. If she shows any signs of her going down hill then I will cull her then.